Ohura at Tokorima

The Ohura is a tributary of the Whanganui River and landuse in the catchment upstream is predominantly rural. The Ohura catchment is undergoing soil conservation work through the Whanganui Catchment Strategy and the Sustainable Landuse initiative to reduce sediment from erosion prone land entering the river.

Water quality results measured at this site reflect the cumulative impact of all activities upstream of this point The geology of this catchment makes it susceptable to erosion, sediment eroding into the river can impact on water quality as it decreases clarity, increases turbidity and brings a number of other contaminants into the water also.

Water Quality

Water quality data for this site

Can I trust this data?

This dashboard shows information on the data collected by the regional councils for water quality indicators, analysed as state and trend.

State

State shows how the median of samples from this site compares to other sites.

This site is a Lowland Rural site. Currently showing the state of this site compared to:

The Cawthron Institute has worked alongside regional councils to verify the processes and methods used for data collection, laboratory analysis of samples collected and the statistical analysis and interpretation of the results presented.

If all Cawthron ticks are green, then you can trust this data. However, if one or more ticks are orange, then conclusions should be treated with some caution.

All samples were collected using approved field protocols and have been analysed in accredited laboratories. Therefore the data shown here has been collected and analysed following best practice.

State

All samples were collected using approved field protocols and have been analysed in accredited laboratories.

Trend - SAMPLING FREQUENCY

Samples are collected monthly at this site. Proposed national guidelines suggest monthly sampling is required for trend analysis. Therefore, any trends shown here are based on best practice in terms of sampling frequency.

Bacteria

E. coli

{{medianValue('ECOLI')}}

State

{{stateMsg(ECOLI.StateScore)}}

State

{{ECOLI.NofBand | uppercase}}

NOF Band

N/A

NOF Band

Trend

{{trendMsg(ECOLI)}}

Sample history at this site

Showing:

–

E. coli samples for Ohura at Tokorima

n/100ml

What is this graph showing me?

This graph is displaying E. coli concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

What do the icons mean?

For at least half the time, the estimated risk is <1 in 1000 (0.1% risk). The predicted average infection risk is 1%*.

B

For at least half the time, the estimated risk is <1 in 1000 (0.1% risk). The predicted average infection risk is 2%*.

C

For at least half the time, the estimated risk is <1 in 1000 (0.1% risk). The predicted average infection risk is 3%*.

D

20-30% of the time, the estimated risk is >=50 in 1000 (>5% risk). The predicted average infection risk is >3%*.

E

For more than 30% of the time, the estimated risk is >=50 in 1000 (>5% risk). The predicted average infection risk is >7%*.

* The predicted average infection risk is the overall average infection to swimmers based on a random exposure on a random day,
ignoring any possibility of not swimming during high flows or when a surveillance advisory is in place (assuming that the
E. coli
concentration follows a lognormal distribution). Actual risk will generally be less if a person does not swim during high flows.

Clarity

State

{{stateMsg(BDISC.StateScore)}}

Trend

{{trendMsg(BDISC)}}

Sample history at this site

Showing:

–

Black Disc samples for Ohura at Tokorima

metres

What is this graph showing me?

This graph is displaying Black Disc readings over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

State

{{stateMsg(TURB.StateScore)}}

Trend

{{trendMsg(TURB)}}

Sample history at this site

Showing:

–

Turbidity samples for Ohura at Tokorima

NTU

What is this graph showing me?

This graph is displaying Turbidity levels over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Nitrogen

State

{{stateMsg(TN.StateScore)}}

Trend

{{trendMsg(TN)}}

Sample history at this site

Showing:

–

Total Nitrogen samples for Ohura at Tokorima

g/m3

What is this graph showing me?

This graph is displaying Total Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

State

State

{{TON.NofBand | uppercase}}

NOF Band

N/A

NOF Band

Trend

{{trendMsg(TON)}}

Sample history at this site

Showing:

–

Total Oxidised Nitrogen samples for Ohura at Tokorima

g/m3

What is this graph showing me?

This graph is displaying Total Oxidised Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Water quality is not considered suitable for the designated use.Impacts on growth of multiple species, and effects starts approaching acute impact level (i.e. risk of death) for sensitive species at higher concentrations (>20 mg/L).

State

State

{{NH4.NofBand | uppercase}}

NOF Band

N/A

NOF Band

Trend

{{trendMsg(NH4)}}

Sample history at this site

Showing:

–

Ammoniacal Nitrogen samples for Ohura at Tokorima

g/m3

What is this graph showing me?

This graph is displaying Ammoniacal Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Phosphorus

State

{{stateMsg(DRP.StateScore)}}

Trend

{{trendMsg(DRP)}}

Sample history at this site

Showing:

–

Dissolved Reactive Phosphorus samples for Ohura at Tokorima

g/m3

What is this graph showing me?

This graph is displaying Dissolved Reactive Phosphorus concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Trend

Sample history at this site

What is this graph showing me?

Some sites have telemetry monitoring systems in place that can provide up to the minute data. At
this site the following live data measurements are available. Click on the data type for more information.

Flow

Last 7 days

Last 30 days

Last 12 months

What is this graph showing me?

The live flow estimate for this site.

Live data has not been checked for accuracy before displaying. To give you an idea about how much water that is, 0.7 cumecs (m3/sec) would fill an Olympic swimming pool in an hour. A flow of 42 cumecs (m3/sec) would fill the same pool in a minute.

Water Temperature

Last 7 days

Last 30 days

Last 12 months

What is this graph showing me?

The temperature of the water.

Disclaimer

The Environmental Data produced by this page should be used as a guide only. LAWA takes no responsibility for the accuracy of information presented, and accepts no liability for actions taken of others based on this information.